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LBI-39128 MAINTENANCE
30
Use the following procedure to disconnect the terminal
when you are finished:
1. With the Setup Selection Menu shown on the terminal,
Type 1 (for item #1 - Return To Operation Select
Menu) and press the Enter key. The Operation Select
Menu should then be shown on the terminal.
Table 8 - SWR Upper Limit
REFLECTED
POWER (%)
SWR
UPPER LIMIT
50 5.8
33 3.7
25 3.0
20 2.6
17 2.4
14 2.2
12 2.1
11 2.0
10 1.9
2. Type 1 (for item #1 - Disconnect) and press the Enter
key. The “Disconnected - Hit Any Key To Connect”
prompt should then appear on the terminal.
MAINTENANCE
POWER SENSOR CALIBRATION
It is recommended that the power sensors be re-
calibrated every six months. Use the procedures under the
Power Sensor Calibration heading in the Installation section
to re-calibrate the power sensors.
TIME AND DATE ADJUSTMENT
It is recommended that the PMU’s time and date be
checked (and adjusted if necessary) to agree with the System
Manager every six months. This will make it easier to
correlate a specific alarm reported to the System Manager
with a specific event on the PMU’s Alarm History Report
screen. Use the procedure under the PMU Programming
heading in the Installation section to set the time and date.
DIAGNOSTIC SCREENS
When a terminal is connected to the PMU, as described
under the PMU Programming heading in the Installation
section of this manual, two screens are available that may be
useful for diagnostic purposes. They are the Alarm History
Report screen and the Channel Monitor screen.
Alarm History Report Screen
The Alarm History Report screen is a snapshot (at the
time you select the screen) of the last 256 results of all
monitoring that has exceeded an alarm limit, starting with
the most recent first. This includes any monitoring that has
exceeded an alarm limit during the initial delay period after
a transmitter is keyed (which is not reported to the Site
Controller computer as an alarm). Results of current
monitoring that exceed an alarm limit will not be shown as
they occur. To see the results of any new monitoring, you
must re-select the screen to get a new snapshot.
This screen shows the actual measured or calculated
value - not just that it was a transmitter alarm for channel #8
or an antenna alarm for antenna #1 (as is reported to the Site
Controller computer). Connect the terminal to the PMU and
access the PMU as described under the PMU Programming
heading in the Installation section of this manual. Then use
the following procedure to access the Alarm History Report
screen:
1. With the Operation Select Menu (main menu) shown on
the screen, type 2 (for item #2 - Reports) and press the
Enter key. The Report Selection Menu should then
appear on the terminal as shown in Figure 23.
2. Type 3 (for item #3 - Alarm History) and press the
Enter key. The Alarm History Report screen should
then appear on the terminal as shown in Figure 24.
Channel Monitor Screen
The Channel Monitor screen is used to display the
power calculated by a specific Analog Input Channel or the
SWR calculated by a specific Analog Pseudo Channel,
whether the value exceeds the alarm limits or not. The
Channel Monitor screen has two parts. The first part is a
snapshot of the calculated value at the time the screen is
selected (see Figure 25). It is shown only briefly before
going on to the second part of the screen.